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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> From: "Neil" <ksleep@sympatico.ca> Newsgroups: sci.electronics.design References: <VTXw9.11569$et4.1696257@news20.bellglobal.com> <aq1k09$2qi$1@reader08.wxs.nl> Subject: Re: Need help designing a circuit X-Newsreader: Microsoft Outlook Express 6.00.2800.1106 Message-ID: <0_%w9.12254$h_4.1832985@news20.bellglobal.com> Date: Sat, 2 Nov 2002 21:03:15 -0500 NNTP-Posting-Host: 64.229.48.94 NNTP-Posting-Date: Sat, 02 Nov 2002 21:37:48 EST Organization: Bell Sympatico Actually, that's a pretty good idea. Several PIRS would not be needed, and its pretty easy to stop a turntable once a signal is received. The PIR that I'm using is one from a exterior light, so its pretty sensitive, and has a pretty wide field of view. The turntable will be rotating pretty fast, so I doubt anything will be missed that is moving within its field of view. "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:aq1k09$2qi$1@reader08.wxs.nl... > > "Neil" <ksleep@sympatico.ca> wrote in message > news:VTXw9.11569$et4.1696257@news20.bellglobal.com... > > Ok...I'm not very bright...I haven't embraced microcontrollers, and like > to > > do things with good old fashioned components and IC's. Keeping this in > mind, > > I need a circuit that senses the position of an object, then turns on a > > motor to power a turntable to turn toward the object. I have several P.I.R > > detectors that will be placed in the center of the turntable. So I need a > > circuit that will sense which PIR has detected the object, and then > switches > > off once the turntable is has turned towards the direction of the sensing > > PIR.. It doesn't need to have any sort of accuracy, as long as the > turntable > > stops close to the subject(within about +/- 20 or 30 degrees). The > > switching can be either electro mechanical, or use LED Emitter/ Detectors. > > Any ideas?. > > Thanks in advance. > > You don't so much need a circuit as an algorithm. You have "a couple" of > passive infra-red (PIR) sensors mounted on a turntable, and you want a > circuit which will do something when one of the PIR sensors has "detected" > an object. > > You don't specify the aceeptance angle of the PIR sensors, and and you don't > specify what sort of signal the PIR sensor is producing when it detects the > object you want to detect (whatever it is). > > The econimical way of doing this job is with a single sensor on a rotating > turntable - as the turnatable rotates the the single scanner scans > everything. When it "detects" something - it's output signal moves > significantly outside the range generated by random noise in the detector, > and moving non-objects in the field of view - you stop the turntable. > > For more class, you rotate the turntable with a stepper motor, and don't > stop the turntable immediately, but merely note the position (or start > counting steps) and allow the turntable to continue to rotate until the > anomalous signal sinks back into insignificance, after which you reverse the > turntable back through half the number of steps, and then stop it. > > Once you've got the rotating turntable, extra sensnors are a waste of time. > > Advice on the sort of switches to use depends on you telling us how you > rotate the turntable, and how big the turntable actually is. My guess would > be a turntable out of a an audio system but even that covers a wide range of > possibilities. > > ---------- > Bill Sloman, Nijmegen > > </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>